Question

A rectangle's length is 15cm longer than its width. If its perimeter is 210 cm, find the length

Answer 1

perimeter = 2(l+b)

210 = 2(15 + 2x)

105  = 15 + 2x

x = 45

then length = 60

width = 45

Answer 2

Answer:

let width = x

length = 15+x

given perimeter =210cm

Perimeter = 2(l+b)

210 = 2(15+x+x)

210 =2(15+2x)

210/2 =15+2x

105 =15+2x

105-15 = 2x

90 =2x

90/2 = x

45 = x

width = x= 45

length = x + 15 = 45 + 15 = 60

Hope it helps